1834 - Thomas Davenport of Vermont developed the first real electric motor ('real' meaning powerful enough to do a task) although Joseph Henry and Michael Faraday created early motion devices using electromagnetic fields.
Below is a more detailed usage of operating systems according to age group: 18 to 34 years old. Of all the smartphone users, 50% use Android as operating system, 43% use iPhone, 39% use Microsoft and 38% use RIM. Apparently, more users prefer Android.
, 25 year silcon valley veteran, current CTO. When I was in college, at the age of 20, we had a class project to implement most of an operating system in a semester. We had to build an IO system, a file system, a memory allocation system, a boot loader, a program loader, and a page manager. Most people in that course completed the task and passed.